Principal Cities: The largest city in the -03 timezone is Buenos Aires from Argentina with population about 13.076 million people. Other major cities in the area are Sao Paolo, Rio de Janeiro, Santiago, Salvador

Daylight Saving: (-03) is a daylight saving/summer timezone, however during winter some places adjust time for one hour back and observe (-04).

End: -03 ended and clocks were set one hour back on Sunday, April 7, 2019, at 0:00 (0:00 am) local time.

Start: -03 starts and clocks are set one hour forward on Sunday, September 8, 2019, at 0:00 (0:00 am) local time.